车辆是路边植物积聚灰尘的主要原因之一。植物可以拦截成吨的灰尘，吸收噪音，并在繁忙的高速公路上充当隔音屏障。植被作为空气污染物的汇，有助于降低环境中的粉尘浓度。考虑到这一点，目前的研究是在印度喜马偕尔邦索兰地区从帕尔瓦努到索兰的22号国道上进行的。具体来说，四种植物分别是Grewia optiva Drummond ex Burret，香椿ciliata M. Roem，苦楝和Woodfordia florbunda (L.)。选取高速公路两侧大小、年龄、分布均匀、多发的库尔兹进行研究。对所选植物在一年中的三个主要季节(雨季、冬季和夏季)叶片上的积尘量进行了估算。在距离道路两侧0-5 m和5-10 m两个水平距离处采集样本。结果表明:叶片上的积尘量从纤毛蒿的0.0083 g m^-2到青花蒿的0.0597 g m^-2，积尘量从大到小依次为青花蒿;W.佛罗里达&; M. azedarach > T. ciliata. Season wisethe examined plant species followed the descending order winter > summer > rainy season. Plants grown at a distance of 0-5 m accumulated higher dust on their leaves as compared to 5-10 m distance from the road. Due to surface characteristics of twigs, bark and foliage of the plants particulate matters are captured by them and remain there for extended time period. From the results of this study, it could be inferred that the air quality in urban/ arid areas can be improved by planting firstly the species G. optiva and W. floribunda along road sides of similar highways to national highway-22.